package com.lkd.interceptor;

import com.google.gson.Gson;
import com.lkd.constant.JwtClaimsConstant;
import com.lkd.context.UserHolder;
import com.lkd.result.Result;
import com.lkd.utils.JwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * jwt令牌校验的拦截器
 */
@Component
@Slf4j
public class JwtTokenAdminInterceptor implements HandlerInterceptor {

    @Autowired
    private Gson gson;

    /**
     * 校验jwt
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String token = request.getHeader("Authorization");
        //判断当前拦截到的是Controller的方法还是其他资源
        if (!(handler instanceof HandlerMethod)) {
            //当前拦截到的不是动态方法，直接放行
            return true;
        }
        log.info("请求路径："+request.getRequestURI());
        try{
            Claims claims = JwtUtil.parseJWT("wangjie",token);
            Integer id = (Integer) claims.get(JwtClaimsConstant.USER_ID);
            UserHolder.set(Long.valueOf(id));
        }catch (Exception e){
            log.info("请求路径："+request.getRequestURI());
            log.info("token错误");
            String json = gson.toJson(Result.error(""));
            response.setContentType("application/json;charset=utf-8");
            response.getWriter().write(json);
            return false;
        }

        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        UserHolder.remove();
    }
}
